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write-removable surface

Background

� � � � � � � � � � � In
the past, traditional classroom education relied entirely upon a blackboard and
chalk as the medium for demonstration construction.� This technique has proven to be relatively messy due to the chalk
dust and smaller pieces of broken chalk.�
Blackboards are also limited in the range of chalk colors they can
accept due to their dark color and difficulty in completely erasing chalk
colors other than white.�

� � � � � � � � � � � A
more economical solution to this problem is the use of dry erasable marking
systems or dry-erase boards which use erasable marking pens to provide the
utility of a blackboard or chalkboard, while eliminating the mess of chalk dust
and the cleanup of multiple colors.�
Dry-erase boards typically have a smooth, markable, coated writing
surface formed by coating a substrate with a lacquer coating which is
subsequently cured.�

� � � � � � � � � � � Previously
made dry-erase boards include writing surfaces made of coated paper or film,
melamine, or ceramic which are adhered to smooth, hard, rigid substrates such
as paper board, fiber board, plastic, wood, and the like.� Coated paper and film based dry-erase
surfaces are relatively inexpensive, however, suffer from a number of
disadvantages.� The erasable, markable
character of these surfaces deteriorates gradually with repeated application
and erasure of dry erasable inks.� The
chemical materials used to mark these surfaces often cause deformation of these
surfaces resulting in the formation of non-removable ghost images after continued
use.� These surfaces are also known to
exhibit poor solvent resistance and are often incompatible with certain
dry-erase markers.� � Ceramic based dry
erase surfaces provide good erasability but are relatively expensive.

�

Summary

� � � � � � � � � � � The
present disclosure provides a write-removable article which comprises and
preferably consists essentially of a fluoropolymer film attached to a substrate
via an adhesive.� The adhesive may be
either a pressure-sensitive adhesive or a thermoset adhesive.�

� � � � � � � � � � � “Write-removable”
means either directly erasable or removable using solvent without affecting the
ability of the surface to accept writing; that is, the surface is
reusable.� � � � � � � � � � � � Advantages of the write-removable articles of the present
disclosure include that they are impervious to fluids typically used in markers
used on write erase-boards and...